Business Combinations - Composition of Consideration (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions					12 Months Ended
	Jul. 16, 2021	Jul. 16, 2020	Jul. 16, 2018	Oct. 06, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition, Contingent Consideration [Line Items]
CEC common stock				$ 8,103			$ 5,176	[1]
Deferred consideration					$ 0	$ 66	$ 0
Total OpCo equity value				$ 2,726
Stock issued during period (in shares)				633
Centaur Holdings, LLC
Business Acquisition, Contingent Consideration [Line Items]
Cash paid			$ 1,636
Deferred consideration			66
Total purchase price			$ 1,702
OpCo
Business Acquisition, Contingent Consideration [Line Items]
Cash paid				$ 700
CEC common stock				1,774
Total purchase price				2,474
Settlement of pre-existing relationships				252
Total OpCo equity value				$ 2,726
Stock issued during period (in shares)				139
Shares issued (usd per share)				$ 12.80
Forecast | Centaur Holdings, LLC
Business Acquisition, Contingent Consideration [Line Items]
Business combination deferred consideration face value	$ 50	$ 25

[1] See Note 1 .